first such book was Sebastian Virdung's 1511 treatise Musica getuscht und ausgezogen ('Music Germanized and Abstracted'). Virdung's work is noted as being particularly thorough for including descriptions of "irregular" instruments such as hunters' horns and cow bells, though Virdung is critical of the same. Other books followed, including Arnolt Schlick's Spiegel der Orgelmacher und Organisten ('Mirror of Organ Makers and Organ Players') the following year, a treatise on organ building and organ playing. Of the instructional books and references published in the Renaissance era, one is noted for its detailed description and depiction of all wind and stringed instruments, including their relative sizes. This book, the Syntagma musicum by Michael Praetorius, is now considered an authoritative reference of sixteenth-century musical instruments. In the sixteenth century, musical instrument builders gave most instruments – such as the violin – the "classical shapes" they retain today. An emphasis on aesthetic beauty also developed; listeners were as pleased with the physical appearance of an instrument as they were with its sound. Therefore, builders paid special attention to materials and workmanship, and instruments became collectibles in homes and museums. It was during this period that makers began constructing instruments of the same type in various sizes to meet the demand of consorts, or ensembles playing works written for these groups of instruments. Instrument builders developed other features that endure today. For example, while organs with multiple keyboards and pedals already existed, the first organs with solo stops emerged in the early fifteenth century. These stops were meant to produce a mixture of timbres, a development needed for the complexity of music of the time. Trumpets evolved into their modern form to improve portability, and players used mutes to properly blend into chamber music. Baroque Beginning in the seventeenth century, composers began writing works to a higher emotional degree. They felt that polyphony better suited the emotional style they were aiming for and began writing musical parts for instruments that would complement the singing human voice. As a result, many instruments that were incapable of larger ranges and dynamics, and therefore were seen as unemotional, fell out of favor. One such instrument was the shawm. Bowed instruments such as the violin, viola, baryton, and various lutes dominated popular music. Beginning in around 1750, however, the lute disappeared from musical compositions in favor of the rising popularity of the guitar. As the prevalence of string orchestras rose,